Buggy code:
public class FormTester { protected abstract class ChoiceSelector { private final class SearchOptionByIndexVisitor implements IVisitor < Component , Component > { int count = 0 ; private final int index ; private SearchOptionByIndexVisitor ( int index ) { } public void component ( final Component component , final IVisit < Component > visit ) { } } private final FormComponent < ? > formComponent ; protected ChoiceSelector ( FormComponent < ? > formComponent ) { } protected abstract void assignValueToFormComponent ( FormComponent < ? > formComponent , String value ) { } protected final void doSelect ( final int index ) { } @ SuppressWarnings ( "unchecked" ) private String selectAbstractChoice ( final FormComponent < ? > formComponent , final int index ) { } } private class ChoiceSelectorFactory { private final class MultipleChoiceSelector extends FormTester . ChoiceSelector { protected MultipleChoiceSelector ( FormComponent < ? > formComponent ) { } @ Override protected void assignValueToFormComponent ( FormComponent < ? > formComponent , String value ) { } } private final class SingleChoiceSelector extends FormTester . ChoiceSelector { protected SingleChoiceSelector ( FormComponent < ? > formComponent ) { } @ Override protected void assignValueToFormComponent ( FormComponent < ? > formComponent , String value ) { } } protected FormTester . ChoiceSelector create ( FormComponent < ? > formComponent ) { } protected FormTester . ChoiceSelector createForMultiple ( FormComponent < ? > formComponent ) { } private boolean allowMultipleChoice ( FormComponent < ? > formComponent ) { } } private final FormTester . ChoiceSelectorFactory choiceSelectorFactory = new FormTester . ChoiceSelectorFactory ( ) ; private boolean closed = false ; private final String path ; private final BaseWicketTester tester ; private final Form < ? > workingForm ; protected FormTester ( final String path , final Form < ? > workingForm , final BaseWicketTester wicketTester , final boolean fillBlankString ) { } public Form < ? > getForm ( ) { } public String getTextComponentValue ( final String id ) { } public FormTester select ( final String formComponentId , int index ) { } public FormTester selectMultiple ( String formComponentId , int [ ] indexes ) { } public FormTester selectMultiple ( String formComponentId , int [ ] indexes , final boolean replace ) { } public FormTester setValue ( final String formComponentId , final String value ) { } public FormTester setValue ( final Component formComponent , final String value ) { Args . notNull ( formComponent , "formComponent" ) ; checkClosed ( ) ; if ( formComponent instanceof IFormSubmittingComponent ) { setFormSubmittingComponentValue ( ( ( IFormSubmittingComponent ) ( formComponent ) ) , value ) ; } else if ( formComponent instanceof FormComponent ) { setFormComponentValue ( ( ( FormComponent < ? > ) ( formComponent ) ) , value ) ; } else { <START_BUG> fail ( ( ( "Componet<seq2seq4repair_space>with<seq2seq4repair_space>id:<seq2seq4repair_space>" + ( formComponent . getId ( ) ) ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>FormComponent" ) ) ; <END_BUG> } return this ; } public FormTester setValue ( String checkBoxId , boolean value ) { } public FormTester setFile ( final String formComponentId , final File file , final String contentType ) { } public FormTester submit ( ) { } public FormTester submit ( final String buttonComponentId ) { } public FormTester submit ( final Component buttonComponent ) { } public FormTester submitLink ( String path , final boolean pageRelative ) { } private FormTester addFormComponentValue ( FormComponent < ? > formComponent , String value ) { } private void checkClosed ( ) { } private boolean parameterExist ( final FormComponent < ? > formComponent ) { } private void setFormComponentValue ( final FormComponent < ? > formComponent , final String value ) { } private void setFormSubmittingComponentValue ( IFormSubmittingComponent component , String value ) { } private void fail ( String message ) { } }

Fix:
fail ( ( ( "Component<seq2seq4repair_space>with<seq2seq4repair_space>id:<seq2seq4repair_space>" + ( formComponent . getId ( ) ) ) + "<seq2seq4repair_space>is<seq2seq4repair_space>not<seq2seq4repair_space>a<seq2seq4repair_space>FormComponent" ) ) ;